- Buccal gingival margin measurement: Distance between the mid-facial gingival margin and the incisal edge of adjacent teeth The distance from the zenith of adjacent teeth to the most coronal part of the incisal edge, will be measured from study casts and digital photographs. This measurement will serve to determine the buccal gingival recession/growth when compared with further measurements. It will be recorded as "0" at baseline. (Figure 3)